Triassic
Triassic /tɹaɪˈæs.ɪk/ nghĩa là thuộc kỷ Tam Điệp
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thuộc kỷ Tam Điệp
Of or from the geologic strata above the Permian and below the Jurassic; of or belonging to the period 250 to 200 million years ago when these strata were laid down.
The Permian–Triassic extinction event occurred about 250M years ago.
Dinosaurs first appeared earlier in the Triassic Period, roughly 230 million years ago.